Have you no shame MTN?

I have been paying for mtn insurance for over 2 years now. I have never used it and MTN have advised, that since upgrading my handset, I am no longer covered but they can't help me cancel the insurance policy.

I took the policy with MTN, I pay them every month but I need to cancel with a company that has no valid contact details? How can it be possible for service providers to ***** from their customers and we are powerless to do anything about it. Have you no shame MTN?